chrome: Cleanup class/struct forward declarations

chrome/test/nacl/pnacl_header_test.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_TEST_NACL_PNACL_HEADER_TEST_H_
 #define CHROME_TEST_NACL_PNACL_HEADER_TEST_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 #include "content/public/common/resource_type.h"
 
-namespace base {
-class FilePath;
-}
-
 namespace net {
 namespace test_server {
 struct HttpRequest;
 class HttpResponse;
 }
 }
 
 using content::ResourceDispatcherHostDelegate;
 
 class TestDispatcherHostDelegate : public ResourceDispatcherHostDelegate {
@@ skipping 36 matching lines @@
   std::unique_ptr<net::test_server::HttpResponse> WatchForPexeFetch(
       const net::test_server::HttpRequest& request);
 
   int noncors_loads_;
   int cors_loads_;
   TestDispatcherHostDelegate test_delegate_;
   DISALLOW_COPY_AND_ASSIGN(PnaclHeaderTest);
 };
 
 #endif  // CHROME_TEST_NACL_PNACL_HEADER_TEST_H_